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Commit f03c9001 authored by Louis Chang's avatar Louis Chang
Browse files

Removes the hidden tasks that exceeds the cache limit 

Allows the system to cache a small number of hidden tasks and
remove the oldest hidden task when exceeds the cache limit.

Bug: 288627637
Bug: 166143360
Test: atest RecentTasksTest
Change-Id: Ibb0a61fb1fa3543e8d6b6982d1b6f8325982abcb
parent 27fbbeb2

services/core/java/com/android/server/wm/RecentTasks.java

+9 −3
Original line number Diff line number Diff line
@@ -183,6 +183,8 @@ class RecentTasks { 


    /** The non-empty tasks that are removed from recent tasks (see {@link #removeForAddTask}). */

    private final ArrayList<Task> mHiddenTasks = new ArrayList<>();

    /** The maximum size that the hidden tasks are cached. */

    private static final int MAX_HIDDEN_TASK_SIZE = 10;



    /** Whether to trim inactive tasks when activities are idle. */

    private boolean mCheckTrimmableTasksOnIdle;
@@ -1477,9 +1479,13 @@ class RecentTasks { 
        return task.compareTo(rootHomeTask) < 0;

    }



    /** Remove the tasks that user may not be able to return. */

    /** Remove the tasks that user may not be able to return when exceeds the cache limit. */

    private void removeUnreachableHiddenTasks(int windowingMode) {

        for (int i = mHiddenTasks.size() - 1; i >= 0; i--) {

        final int size = mHiddenTasks.size();

        if (size <= MAX_HIDDEN_TASK_SIZE) {

            return;

        }

        for (int i = size - 1; i >= MAX_HIDDEN_TASK_SIZE; i--) {

            final Task hiddenTask = mHiddenTasks.get(i);

            if (!hiddenTask.hasChild() || hiddenTask.inRecents) {

                // The task was removed by other path or it became reachable (added to recents).
@@ -1523,7 +1529,7 @@ class RecentTasks { 
                // A non-empty task is replaced by a new task. Because the removed task is no longer

                // managed by the recent tasks list, add it to the hidden list to prevent the task

                // from becoming dangling.

                mHiddenTasks.add(removedTask);

                mHiddenTasks.add(0, removedTask);

            }

            notifyTaskRemoved(removedTask, false /* wasTrimmed */, false /* killProcess */);

            if (DEBUG_RECENTS_TRIM_TASKS) {